function showPhoto (nazev,titulek) {
  document.getElementById("frame").innerHTML = "<img src='../images/photo/"+nazev+"' width='400px' height='300px' border='2px' />";
  document.getElementById("comment").innerHTML = titulek;
  document.getElementById("osize").innerHTML = "<a href='../images/photo/"+nazev+"'>originální velikost</a>";
}